JPH01159574A - Temperature controller - Google Patents

Abstract

PURPOSE: To save electric energy of a refrigerating machine by forcedly interrupting the refrigerating machine by a set time for every predetermined time when temperature adjusting conditions of a load space are completed. CONSTITUTION: A large scaled integrated circuit 24 constituting a centralized controller 8 for controlling operation of a refrigerating machine includes therein a load management logic 25, a temperature management logic 26, a time management logic 2, and a system controller. In the large scaled integrated circuit 24 there is executed sequence control that includes temperature conditions and defrosting conditions of a load space associated with the refrigerating machine that is an object of total electric power control and consumption electric power amount control. When no defrosting signal and no temperature signal are outputted but a forced interruption permission signal is outputted from the temperature management logic 26, there is outputted a signal of forcedly interrupting the refrigerating machine only by set time for every predetermined time. Hereby, electric energy of the refrigerating machine can be saved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a temperature control device for intermittently stopping the operation of a refrigerator equipped with a cooling heat exchanger.

Electrical equipment includes not only regular lighting, blower motors, and hot water boilers, but also refrigerated showcases, refrigerators, and refrigerators for air conditioning equipment. For example, large stores such as supermarkets and department stores as shown in Figure 1 (1)
There is. This power receiving equipment is connected to an appropriate power receiving device (2
), the showcase refrigerator (Rr > (R1)... (RK) (RK-*)
Electrical equipment such as = (Rn-r) (Rn), an air conditioning refrigerator (3), a refrigerator for cold storage (4), a lighting equipment (5), and a blower (not shown) are being operated. Also, the showcase refrigerator has one compressor (CI) like (R1).
Three product storage units (L+) (11) (consisting of a refrigeration cycle with a condenser (6) and a liquid receiver (7) to cool La, and one unit (R,) Compressor (an
) with two product storage units (La) (t, s) connected to it, and two compressors (R8) connected in parallel as shown in (R8).
C,)(C,') has three product storage units (t*)(t,
) (L8), such as (Rn-r) (Rn), one compressor (Cn-r) (Cn) is used to cool one product storage section (Ltn).
-1) There are various types of refrigerators, such as those with a refrigeration cycle configured to perform (Lm) cooling.
Although not particularly shown in the figure, refrigerators for cold storage warehouses (4) are equipped with compressors and condensers like the refrigerators for showcases, and the load space associated with each refrigerator passes through a cooling heat exchanger. Refrigeration and air-conditioning equipment is made up of these cooled air.

Furthermore, (v, >(s+ >, (vt)(sz >
- (Vm) (Sm) - (s'> (s”) is installed one by one, corresponding to the load space related to the refrigerator, such as each product storage section (t,,) (Li)... refrigerant liquid control solenoid valve (hereinafter referred to as liquid solenoid valve) and a temperature sensor for the product storage section, and each liquid solenoid valve detects when the temperature of the product storage section reaches the set temperature, the load space is Operates to close the valve separately and independently of the associated refrigerator or other load space.

For example, when the temperature of the product storage section (L,) reaches the set temperature, only the liquid solenoid valve (■1) is closed, and the cooling heat of the product storage section (L! > (ts) that has not reached the set temperature) is closed. The liquid solenoid valves (vx) (vn) that supply liquid refrigerant to the exchanger remain open, and the compressor (C1) to which this product storage section (L,) is related is closed when the liquid solenoid valve (■1) is closed. The company continues to operate without any direct relationship with the company.

The power required to operate such refrigeration and air conditioning equipment varies greatly depending on the load conditions of each refrigerator, such as the amount of stored products, rotation rate, number of customers, outside air conditions, and frost formation. Therefore, when each refrigerator is left to operate freely, it is necessary to set the capacity of the power receiving equipment according to the expected maximum power usage at the moment. Furthermore, if a control device capable of rationally reducing the power consumption of electrical equipment operated simultaneously can be obtained, the running costs of power receiving equipment and the electrical energy consumption can be greatly reduced.

The present invention is used in large stores such as supermarkets, and is intended to forcibly stop the operation of showcase refrigerators, etc., which are operated throughout the year, for a set time at regular intervals to save electrical energy consumption. A forced stop is performed only when the temperature control conditions of the load space are met.

The present invention will be described in detail below based on the drawings.

FIG. 2 is a block configuration diagram showing an embodiment in which the control device of the present invention is applied to the large-scale store equipment shown in FIG. It is represented by the number.

(X+)(X,)...(Xn) is a compressor (C1) (Cffi)...(C
relay to supply and stop power to n), (P+) (Pt
'), (Pg) (Pa')''-(Pn) are a centralized controller (8) and relays (xI) (x, ) and relays (x,
... (xn), and (9) connects the temperature input from the temperature sensor (S, > (Sa) ... (Sn) of each product storage section to the central controller (8). Follow the instructions to switch the voltage frequency converter (10) and counter (11) in sequence.
(13) is a relay for power supply to timer loads (14) such as lighting equipment (5) and boilers (not shown) that need only start and stop power supply at a fixed time; (15) is an alarm display device, (16) is an alarm notification device, (Q) is an input device for control setting values, (17) is a time display device, (18) is a power consumption recording device, (19) is a control (20) is a storage device for storing setting values and programs (hereinafter referred to as ROM); (20) is a storage device for program control execution (hereinafter referred to as RAM);
2) is a converter for detecting the power usage of the power receiving equipment, and (23) is a power usage indicator.

Therefore, the large-scale integrated circuit (
24) has a built-in load management logic (25), temperature management logic (26), time management logic (27) that divides the frequency of the commercial frequency power supply and manages time, and a system controller (not shown). address bus (28
), data bus (29) (29) input/output boat (30)
It is connected to ROM (19), RAM (20), and input/output interface (12) via.

The control setting value input device (Q) includes, for example, the setting of the control temperature of each freezing and refrigerating equipment (Q,), the switching time setting of the power consumption control (Q,), which will be described later, and the setting of the stop time (Q4).
), maximum allowable power setting (Q, ), power differential setting (Q, ), night set pack setting (Q7), timer load management time setting (Q8), etc., and all of these settings are related to the setting value and the refrigerator or product. The number of the storage section is sent to the input/output interface by converting the operation value of the numeric keypad or low-return switch into a digital quantity. Alarm display device (
15) is a suitable light emitting element (F+>
Displayed by (Fg)...(Fl2), the display contents include, for example, excessive power usage alarm (Fl), load display during additional time control (F,)...Load space such as product storage area, etc. Temperature abnormality alarm (Fiffi)... Power outage alarm (Fiffi)
ll), self-check function failure alarm (Fffi), etc., including temperature abnormality alarm (Fl-2), power outage alarm ffff1-+), and self-check function failure alarm (Fffi).
The output signal of 2) is connected to an alarm notification device for a security company, security station, etc. via an OR logic element (31).

Control of the power receiving equipment having such a configuration will be explained below.

In order to simplify the explanation of the present invention, the refrigerator in FIG. 1 and FIG. 2 related to its explanation is a compressor (C+).
(Ct)・”(Cn-t) (Cn) is the relay (Xt) (
When powered through X, )-(Xn-1)(Xn), each compressor is L")
...(Lm-t) The operation is controlled individually according to the cooling state of (Lm), and when frost forms on the heat exchanger that cools each load space, the operation is controlled independently regardless of other refrigerators. The refrigerator is shown as having a controller (not shown) that enables forced defrosting operation. Therefore, the central controller (8) and the refrigerator (R+) (R-) in the figure
) (3) (4) The relationship between defrost operation status is detected by the defrost detector
Also, the load space (Ll) (Ll)
- (Lm) (L'>(L") temperature is detected by temperature sensor (S
+)(S, )・(Sm)(S')(S"), detected via multiplexer (9), etc., and these detection inputs and various setting values written in advance in storage device (19) And the power supply relays (L) (Xt) to the compressor are controlled by the central controller (8) while taking into account the total power consumption of the power receiving equipment.
... (Xn-+) (Xn) and a liquid solenoid valve (
Vr)(L)...(Vm-+)(Vm)(7)
It is designed to be controlled.

Therefore, to control the power receiving equipment by the central controller (8),
In order to ensure that one or more of the electrical devices that make up the power receiving equipment are in a stopped state, relays (L) (Xa) and
"(Xn-+)(Xn>(13)(7)) By sequentially opening one or more of When the total power consumption (hereinafter referred to as power consumption) in the power receiving equipment exceeds a set value, a predetermined ROM (1
9) Stop electrical equipment according to the order written in
It is combined with a power consumption control mechanism that suppresses power consumption below a set value.

However, if the electrical equipment whose operation is stopped by the output signal from the power consumption control mechanism or the total power consumption control mechanism is a refrigerator, the room or product storage room that is maintained at a low temperature by the refrigerator The load space is stopped after confirming that the temperature condition is unique to that space.The operating relationship is as shown in Figure 3.When the chiller is stopped, the cooling heat exchange Off-cycle defrosting of the equipment is performed.

That is, the power consumption setting value of the power receiving equipment (w,), the power differential (WO), which will be described later, and the cooling temperature of each load space (T+) ( 'rt)...(Tm-ha(Tm)
, total power consumption control switching time (τ1) (τ, ), similarly,
When the stop time (τ゛,) (τ゛c) is written, the load of the refrigerator that constitutes the power receiving equipment is in a normal state, and the power consumption is less than the set value (WS), the total power consumption The output signal from the control mechanism is constant for a certain period of time (τ,) (τ,)
For example, the first group of electrical equipment (CK) (C
+c-t) ... and the second group of electrical equipment (Cn) (
Cn-+)... are set one by one in sequence for the time width (
The corresponding relay (X
=)(Xc-I)...(Xn)(Xn-1)...open output signals are output.

As above, 1/ (XK) (XIC-t)...
・(Xn) (Xn-I)... are sequentially opened and the electrical equipment, which is the compressor of the first and second groups, stops operating in sequence, so that it will not operate when the ambient temperature is higher than 0°C. During the stop time, off-cycle defrosting is sequentially performed using the atmosphere of the cooling heat exchanger corresponding to each compressor.

In this case, when the power consumption exceeds the allowable value (w, ) (point G) due to an increase in the refrigeration load, etc., the power consumption control mechanism will control the power consumption for a certain period of time (τ) (this time period is the total amount of power The output signal is output every time period (preferably shorter than the time width (τ) of the control mechanism), and the second group of electrical equipment (Cn>(C
The corresponding relays (Xn) (Xn-1)... are opened so that the relays (Xn) (Xn-1)... are stopped in a predetermined order.

Note that the classification of the electrical devices into the first group and the second group is for convenience, and when grouping is not necessary, they are treated as C=Cn.

When the power consumption is reduced from the set value (υ3) by an amount equal to or more than the power differential (back) due to such power consumption control, the electrical equipment (Cn) (Cn-□) ( An output signal is issued to increase the number of operating units so that Cn-*)... resumes operation in the reverse order from when it stopped.

After going through this process of power consumption control, if the load condition returns to light load (Hl) or normal load (Hl), power consumption control is no longer necessary and only total power amount control continues. .

As described above, in the power supply control device of the present invention, the power consumption of the power receiving equipment is kept below the rated power of the power receiving equipment by controlling the total power amount, and it is not possible to keep the power consumption below the set value by controlling the total power amount alone. Under conditions where the power consumption is not high, use power consumption control to forcibly stop the operation of electrical equipment with warm temperature control and lighting conditions, and ensure that the power consumption never exceeds the rated power of the power receiving equipment. It is managed as follows.

Therefore, such power consumption control and total power consumption control are based on the premise that the refrigerators included in the electrical equipment, and more specifically, the products in the load space maintained at low temperatures by each refrigerator, are not damaged. Large-scale integrated circuits (24
), an output signal is output through a sequence as shown in FIG. 4 that takes into consideration the temperature conditions of the load space related to the refrigerator that is subject to total power amount control and power consumption control, and defrosting conditions. At this time, part of Fig. 3 (Kl>(
As seen in Kri (K,), there are cases where no output signal is actually output.

That is, in FIG. 4, as in FIG. 2, (15) is a display light emitting diode, (16) is a power alarm, (18) is a used power recording device, (19') is a ROM power system storage section, ( 19”) is also the storage unit for total power amount control, (22
) is a detection converter for the input from the power sensor (22'), (
23) is a power consumption display section, (26) is a temperature management logic which is a temperature control means, and (32) is an AND which is a discrimination means.
Logic, (33) is OR logic, (Q4) is for stop time setting, (Q,) is for maximum allowable power setting, (Q,) is input device for power differential setting, (X') is relay (X) In addition, (35) is a power comparison unit between used power and allowable power, (36) is a clock, (
37) is a stop control unit, (38) is a display converter, (El)
is the total power consumption control mechanism, (E,) is the power consumption control mechanism, (
E, ) indicates a defrosting signal, and (E4) indicates a temperature signal. Under such a sequence, an output signal is output from the total electric energy control mechanism (El) to the electrical equipment that is currently being constructed at regular intervals. In this case, the temperature output signal (E4) is output after a certain period of time has elapsed after the temperature of the load space related to this electrical equipment falls below the set temperature according to the control sequence written in advance in the ROM (19). If not, and this electrical equipment is not related to defrosting, or even if it is related, if it is not defrosting, an output signal that is a forced stop permission signal is output from the temperature management logic (26). Therefore, A receives the output signal which is a forced stop signal from the OR logic (33).
The ND logic (32) outputs an output signal to operate the drive unit (X゛) to indicate the stoppage of the electrical equipment due to total power consumption control using the display light emitting diode (15), and also turns off the relay (X). This electrical equipment is stopped for a set period of time written in the ROM (19), that is, it is forced to stop intermittently. This operation is also controlled by the power consumption control mechanism (
The same is true for the output signal from E,).

That is, according to this sequence, the electrical equipment to be controlled by the control mechanism is a refrigerator, and the defrosting signal (E,
) and temperature signal (E4) are not output and a forced stop permission signal is output from the temperature management logic (26),
When a forced stop signal is output from the total electric energy control mechanism (E,) at regular intervals, the set time OR logic (33)
Then, the AND logic (32) inputs both matching signals, and the operation of the refrigerator is stopped for the set time. In addition, when the refrigerator is in the process of defrosting or has just been defrosted and the temperature of the product storage section, which is the load space, has just reached the set temperature, the defrost signal (E,) or Temperature signal (E4)
does not enter the AND logic (32), so if the signals from the control mechanism (El) (E,) enter the OR logic (33)
Even if the compressor is output after the next total power consumption control cycle, the AND logic (32) is not activated, and the intermittent operation stop of the refrigerator can be avoided. There is no amount control, and temperature control logic (2
6), the compressor will not be stopped by power consumption control unless the condition is such that an output signal is output from 6).

As described above, the temperature control device of the present invention is capable of forcibly stopping the refrigerator for a set time at regular intervals when the temperature control conditions of the load space cooled by the refrigerator are in place. It is possible to save the electric energy of the refrigerator, and even if a forced stop signal is output when the temperature control conditions of the load space are not met, priority is given to temperature control of the load space and intermittent stoppage of the refrigerator is avoided. Therefore, it is possible to perform temperature control that mainly focuses on cooling the objects to be cooled in the load space while saving power.

[Brief explanation of the drawing]

The drawings all show embodiments related to the temperature control device of the present invention, and FIG. 1 is a configuration diagram of electrical equipment showing an example of power receiving equipment in a large-scale store, and FIG. 2 is an electrical diagram of the power supply control device of the present invention. FIG. 3 is a block diagram showing the connections, FIG. 3 is a time chart showing the outline of control, and FIG. 4 is a block diagram showing an example of the load management logic of the block diagram shown in FIG. 2. (R1)(R1)-(Rt)(at, t)-(Rn
-1)(Rn)--Refrigerating machine for showcase, (3)
... Freezer for air conditioning, (4) ... Freezer for cold storage, (8) ... Centralized controller, (L,) ... (Ln
)(L')(L")...Load space, (E□)...
Total power consumption control mechanism (25) Load management logic. No. 30 Sori Diagram 4 Procedural Amendment (Method) January 1999 Nouchiwa＼

Claims (1)

[Claims] 1. A control mechanism that outputs a signal to forcibly stop the operation of the refrigerator for a set time at regular intervals, a temperature management means that outputs a temperature signal and a defrosting signal, and signals from the control mechanism and temperature management 1. A temperature control device comprising: a determining means into which a signal from the control mechanism is input, and stops the refrigerator when the signal from the control mechanism matches the signal from the temperature management means.